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%% This Source Code Form is subject to the terms of the Mozilla Public
%% License, v. 2.0. If a copy of the MPL was not distributed with this
%% file, You can obtain one at https://mozilla.org/MPL/2.0/.
%%
%% Copyright (c) 2007-2020 VMware, Inc. or its affiliates. All rights reserved.
%%
-module(delegate_sup).
-behaviour(supervisor).
-export([start_link/1, start_link/2, count/1, count/2, sup_name/1]).
-export([init/1]).
-define(SERVER, "delegate_").
%%----------------------------------------------------------------------------
-spec start_link(integer()) -> rabbit_types:ok_pid_or_error().
-spec start_link(integer(), string()) -> rabbit_types:ok_pid_or_error().
-spec count([node()]) -> integer().
%%----------------------------------------------------------------------------
sup_name(Prefix) ->
list_to_atom(Prefix ++ "sup").
start_link(Count, Prefix) ->
supervisor:start_link({local, sup_name(Prefix)}, ?MODULE, [Count, Prefix]).
start_link(Count) ->
start_link(Count, ?SERVER).
count(Nodes) ->
count(Nodes, ?SERVER).
count([], _) ->
1;
count([Node | Nodes], Prefix) ->
try
length(supervisor:which_children({sup_name(Prefix), Node}))
catch exit:{{R, _}, _} when R =:= nodedown; R =:= shutdown ->
count(Nodes, Prefix);
exit:{R, _} when R =:= noproc; R =:= normal; R =:= shutdown;
R =:= nodedown ->
count(Nodes, Prefix)
end.
%%----------------------------------------------------------------------------
init([Count, Name]) ->
{ok, {{one_for_one, 10, 10},
[{Num, {delegate, start_link, [Name, Num]},
transient, 16#ffffffff, worker, [delegate]} ||
Num <- lists:seq(0, Count - 1)]}}.
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